To lose weight, you need to create a calorie deficit -- take in fewer calories than you expend. The fastest way to achieve this is through a combination of diet and exercise. Diet reduces your caloric intake so that your body doesn't create more fat.

HI I am 15 years old and my hight is 5 feet 5 inch and weight is 80 kg and i don’t have haypo thayraid problam so please tell me how much weight i need to lose and a diet plan to lose that much weight.